Mill, R. C. (1985). The tourism system: An introductory text. Prentice-Hall.
Cita Chicago (17th ed.)Mill, Robert Christie. The Tourism System: An Introductory Text. Englewood Cliffs, N.J: Prentice-Hall, 1985.
Cita MLA (9th ed.)Mill, Robert Christie. The Tourism System: An Introductory Text. Prentice-Hall, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.